Knocking on Startup? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

636 · 02-01-2014, 03:38 PM

So I've noticed recently when starting my car in the colder temps, when it's cold, it will make a noticable "knock" sound when I first turn it on.

It goes away, and the car doesn't make any other knocking sounds besides that, only when it's cold and it's the first start.

Should I be worried?

JB86'd · 02-01-2014, 03:56 PM

Try searching...or just scrolling down.

http://www.ft86club.com/forums/showthread.php?t=56131

636 · 02-01-2014, 04:04 PM

Quote:

Originally Posted by JB86'd

Try searching...or just scrolling down.

http://www.ft86club.com/forums/showthread.php?t=56131

That's not what I'm experiencing. It's not when the car drops to idle, there's no problems there.

It's as it's clicking over, it sounds like it knocks hard right before it starts up.

humfrz · 02-01-2014, 04:09 PM

Quote:

Originally Posted by 636

So I've noticed recently when starting my car in the colder temps, when it's cold, it will make a noticable "knock" sound when I first turn it on.

It goes away, and the car doesn't make any other knocking sounds besides that, only when it's cold and it's the first start.

Should I be worried?

I wouldn't be worried; the engine is a mechanical thing just getting limbered up......

JB86'd · 02-01-2014, 04:46 PM

Quote:

Originally Posted by 636

That's not what I'm experiencing. It's not when the car drops to idle, there's no problems there.

It's as it's clicking over, it sounds like it knocks hard right before it starts up.

Ah, you said as you first turned it on so I assumed idle. My bad. In that case..I can't help you.

BRZnut · 02-01-2014, 05:07 PM

My BRZ does the same thing since day one when starting in cold weather, and I think others have report the same.

Apex-Wolf · 02-02-2014, 01:18 AM

Does it sound like this guys video???
http://www.ft86club.com/forums/showthread.php?t=57240

frs10 · 02-02-2014, 09:34 AM

Quote:

Originally Posted by Apex-Wolf

Does it sound like this guys video???
http://www.ft86club.com/forums/showthread.php?t=57240

wow that sounds pretty bad...

the knocking from cold weather is pretty common for most cars...?

636 · 02-02-2014, 12:30 PM

Quote:

Originally Posted by Apex-Wolf

Does it sound like this guys video???
http://www.ft86club.com/forums/showthread.php?t=57240

Nope, mine only happens for a split second, then never heard again.

BlackyRose · 02-02-2014, 12:34 PM

Quote:

Originally Posted by 636

Nope, mine only happens for a split second, then never heard again.

Im also in Florida, I get 1-2 hard shaking knocks when I start my car up every cold morning. Perfectly normal.

dem00n · 02-02-2014, 01:13 PM

Are you sure it's not the pre cat warming up...?

636 · 02-02-2014, 11:25 PM

Quote:

Originally Posted by dem00n

Are you sure it's not the pre cat warming up...?

Nah, it's not that crazy. I'll try to capture a video next time I go out.

Bach415 · 02-03-2014, 01:01 AM

@636 its something like a few knocks after you start up the car for the first time of the day then its gone the rest of the day/occurs once a while right? If so I get it once a few start up due to the car being parked outside in the cold. The rpm do drop due to the knock from what I've seen.

636 · 02-03-2014, 01:03 AM

Quote:

Originally Posted by Bach415

@636 its something like a few knocks after you start up the car for the first time of the day then its gone the rest of the day/occurs once a while right? If so I get it once a few start up due to the car being parked outside in the cold. The rpm do drop due to the knock from what I've seen.

No. This is not after a startup at ALL, it's DURING. It's as if the motor shakes so violently during turning on that it's knocking into something.

02-01-2014, 03:56 PM	#2
JB86'd Senior Member Join Date: Oct 2013 Drives: JAWS Location: socal Posts: 703 Thanks: 753 Thanked 437 Times in 224 Posts Mentioned: 27 Post(s) Tagged: 1 Thread(s)	Try searching...or just scrolling down. http://www.ft86club.com/forums/showthread.php?t=56131 __________________

02-02-2014, 01:13 PM	#11
dem00n Member of the year - 2016 Join Date: Jul 2012 Drives: Scion FRS Location: New York Posts: 3,575 Thanks: 788 Thanked 2,427 Times in 1,111 Posts Mentioned: 23 Post(s) Tagged: 0 Thread(s)	Are you sure it's not the pre cat warming up...? __________________ Friends don't let friends Plastidip

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02-01-2014, 05:07 PM	#6
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02-03-2014, 01:01 AM	#13
Bach415 Senior Member Join Date: Feb 2013 Drives: Whiteout FRS Location: San Francisco Posts: 1,245 Thanks: 904 Thanked 414 Times in 296 Posts Mentioned: 31 Post(s) Tagged: 2 Thread(s)	@636 its something like a few knocks after you start up the car for the first time of the day then its gone the rest of the day/occurs once a while right? If so I get it once a few start up due to the car being parked outside in the cold. The rpm do drop due to the knock from what I've seen.

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